That's funny that your sea hair died. I bought one a couple months ago. Acclimated, released, and never saw it again. And never nothing. It was pretty huge to, dont know what happened. Just disappeared. All my algae stuck around though.
exact same thing except w/ pink cyno following close to the sea hair's disappearance.
So my week has been a series of WC, which follow a vigorous scrubbing of rock and any algae encroaching corals.The results have been great. Also have started daily vinegar dosing. Today I cut up any corals that were almost gone and found frag plugs for the parts that were saveable, also pulled frags and removed any algae than dipped in medicoral. Will post pics later.